In Reply to: RE: Loop check for Reactance Annulling posted by mdg on May 1, 2016 at 06:24:39:
To simplify what happens without the complex math, the air mass in a horn adds to the Mms of the driver, effectively reducing its resonant frequency. If said resonant frequency is too low the horn loses sensitivity near the cutoff frequency. Reactance Annulling is a three dollar term used to describe using a small rear chamber to raise the effective driver resonance back up to where it's the same as the horn cutoff frequency, giving higher sensitivity near Fc. When the rear chamber size is correct there will be a major impedance peak at Fc. When it's too large the peak will be below Fc. When the chamber is too small the peak at Fc has value drops, or disappears entirely.
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Follow Ups
- RE: Loop check for Reactance Annulling - Bill Fitzmaurice 08:47:07 05/01/16 (0)